Fix whitespaces

Add support for 5.11 and 5.12 kernels

Fix evdi build on v5.10 kernel

Merge pull request DisplayLink#242 from elguero/el8Fixes-v1.7.x

Adjustments needed to support the latest kernel for RHEL/CentOS 8 and…

Use CI scripts from the latest supported kernel version

(cherry picked from commit 7d2ac4d)

Use min_t instead of min when types don't match

[Travis] Add 5.6 kernel

Retry drop drm master when previous attempt failed

Make drm ioctls call resistnat to EAGAIN and EINTR errors

According to:
https://dri.freedesktop.org/docs/drm/gpu/drm-uapi.html#recommended-ioctl-return-values
"DRM drivers assume that userspace restarts all IOCTLs. Any DRM IOCTL can
return EINTR and in such a case should be restarted with the IOCTL
parameters left unchanged."

trigger mode change event when old framebuffer does not exist

This is a workaround for FourCC being sent only on mode change,
which causes colors to be swapped on Wayland while switching
from Xorg, as they use different color format.